"Could you take the map out please."

Translation: 请你拿出地图。

[Jocke111]

This sentence needs 吧 ba. Is put efter every request

[AbunPang]

You don't need it when you use 请. And even when you don't 吧 is not strictly obligatory, it just makes it sound nicer (less like an order) while also preventing an interpretation a a delclarative clause. So even just 拿出地图 is acceptable for "take out the map", only adding either 吧 or 请 is nicer.